sliding glass door internal lock mechanism repair or replace?

Can you help me figure out what I need to repair this sliding glass door lock? (manufacturer unknown)

Here's the situation:
When I turn the knob from the inside handle it just spins.
When I put the key in the key from the outside handle nothing happens.

Now that I have the handle apart, when I stick a flathead in the door mechanism remaining inside the door the hooks engage ? the top 2 hooks come out and lock up while the bottom 1 comes out and locks down (although they need adjusting as they no longer line up with the frame receivers since I removed them to try to adjust), but when I put the inside and outside handles back on I'm back to the beginning.

My guess is that so much slamming over time broke something, but I can't tell what. It's always been a hard door to lock, as overtime what I think happens is that the frame door hook receivers shift and the hooks just bang against them. I'd love to find a less complex/easier to close and lock door locking system for this door, if you have any ideas to share?